beattqn



(No Model.)

G. B. BRAYTON.

AIR PUMP VALVE. No. 269,914. Patented Jan. 2, 1883.

UNITED STATES PATENT OFFICE.

GEORGE B. BRAYTON, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO 'THE BRAYTON PETROLEUM ENGINE COMPANY, OF SAME PLACE.

AlR-PUMP VALVE.

SPECIFICATION forming part of Letters Patent No. 269,914, dated January 2, 1883.

Application filed April 10, 1882. (No model.)

To all whom it may concern Be it known that LGEORGE BAILEY BRAY- TON, a citizen of the United States, residing at Boston, in the county of Suffolk and State of lvlassachusetts, have invented certain new and useful Improvements in Air-PumpValves; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanyingdrawing, and to letters or figures of reference marked thereon, which forms a part of this specification.

Heretot'ore an obstacle has been met with in the operation of free valves of air-pumps trom the tendency of such valves to flutter upon their seats consequent upon the changes in pressure of the current.

The object of my present invention is to avoid the noise and otherobjectionable results or the fluttering ot' the valves of air-pumps; and leli'ect my object by the employment of a dash-pot composed of an inverted cup secured to the end of the valve-stem and partially in closing a tubular boss or stationary plunger constituting the guide to such stem and erected upon the bottom of the valve box or case, a small aperture being created in the cup to perinit the valve to open and obviate wire-drawin g, so called.

The drawing accompanying this specification represents a section of a valve and its box containing my invention.

1n said drawing, Arepresents the valve box or case of an air-pump,apertures a beingi'ormed in the bottom b of such case to permit of inlet of air thereto.

The valve shown at B, which is a puppet, is disposedoutsideofthe easeA and closes against the bottom of the latter, which constitutes a com mon valve-seat, the valve being closed upon I chamber A and the lower edge or margin of 5 an inverted or pot cup, 0, secured in a proper manner to the top of the valve-stem, which is shown at D as extending upward through a tubular boss or guide, E, erected upon the bottom of the chamber A. The relative positions of the boss or gnide E and cup or pot O are such that when the valve R is closed upon its seat the mouth of such cup incloses the upper end of the said boss. The cup 0 constitutes the pot and the boss E the stationary plunger of a dash-pot. Any tendency to illegitimate fluctuations or flutterings of the valve is neutralized by the dash-pot, which does not,

however, interfere with the legitimate opening and closing of such valve. A small aperture, d, is created in the topot' the cup 0 to permit of legitimate opening ot' the valve and avoid wire-drawing.

I'olaim- 1. In combination with valve-box A, having tubular boss E attached thereto, the valve B, having its stein extending up through said boss, a cup attached .to said stem and fitting over said boss, and a spring which tends to force said cup'away from said boss, substantiall y as set forth.

2. The cup O, having an aperture, (1. for the purposev set forth, in combination with boss E, spring 0, and valve B, substantially as set forth.

In testimony whereofI affix my signaturein presence of two witnesses.

GEORGE BAILEY B RAYTON Witnesses:

H. E. LODGE, -F. CURTIS. 

